<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity5">
<head>
    <title>content</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
<h1>content</h1>
<p>我是登录后才可以看的页面</p>

<form method="post" action="/logout">
    <button  type="submit">退出</button>
</form>
</body>
</html>